Cholpassorn SitthiwarongchaiWeerapon WichayanuparpPanyada ChantakitPawintana CharoenboonSuan Sunandha Rajabhat UniversityMahidol University2020-05-052020-05-052020-01-01Systematic Reviews in Pharmacy. Vol.11, No.3 (2020), 48-5609762779097584532-s2.0-85082396209https://repository.li.mahidol.ac.th/handle/123456789/54704© Advanced Scientific Research. All rights reserved. Handling the employees to motivate them is challenging activity for leaders. This study had the objectives to evaluate the impact of transactional leadership style, to understand and statistically prove the impact of transformational style of leadership, to explore if there is considerable and significant influence of Laissez-faire Leadership style on employees' motivation in the pharmaceutical industry of Thailand. The data collection was through primary sources and collected by the mean of a survey questionnaire using Likert scale with five options for each question. The statistical results were found using SPSS software. Regression and correlation analysis have shown a positive and significant influence of all variables on dependent variable. However, it was explored that people in Thailand, specifically in pharmaceutical industry, prefer transactional style of leadership as it was statistically proven in this study. So, it is recommended to the leaders there to adopt transactional style and link the reward system to performance of their personnel in order to avoid any discrimination.Mahidol UniversityPharmacology, Toxicology and PharmaceuticsArticleSCOPUS10.5530/srp.2020.3.06